Need help, because I need someone to give me a link which explains, how to search in a string for special codes, I want to make an http.connect function which will read data, and take some things, for example the title code and the title code end, and will take the words which are between for example
@TokOut Here’s what you want. Do a search for string.gmatch and Patterns for more info on how to use them.
string.gmatch (s, pattern)
Returns an iterator function that, each time it is called, returns the next captures from pattern (see §6.4.1) over the string s. If pattern specifies no captures, then the whole match is produced in each call.
As an example, the following loop will iterate over all the words from string s, printing one per line:
s = "hello world from Lua"
for w in string.gmatch(s, "%a+") do
print(w)
end
The next example collects all pairs key=value from the given string into a table:
t = {}
s = "from=world, to=Lua"
for k, v in string.gmatch(s, "(%w+)=(%w+)") do
t[k] = v
end
For this function, a caret '^' at the start of a pattern does not work as an anchor, as this would prevent the iteration.
6.4.1 – Patterns
Patterns in Lua are described by regular strings, which are interpreted as patterns by the pattern-matching functions string.find, string.gmatch, string.gsub, and string.match. This section describes the syntax and the meaning (that is, what they match) of these strings.
Character Class:
A character class is used to represent a set of characters. The following combinations are allowed in describing a character class:
x: (where x is not one of the magic characters ^$()%.[]*+-?) represents the character x itself.
.: (a dot) represents all characters.
%a: represents all letters.
%c: represents all control characters.
%d: represents all digits.
%g: represents all printable characters except space.
%l: represents all lowercase letters.
%p: represents all punctuation characters.
%s: represents all space characters.
%u: represents all uppercase letters.
%w: represents all alphanumeric characters.
%x: represents all hexadecimal digits.
%x: (where x is any non-alphanumeric character) represents the character x. This is the standard way to escape the magic characters. Any non-alphanumeric character (including all punctuation characters, even the non-magical) can be preceded by a '%' when used to represent itself in a pattern.
[set]: represents the class which is the union of all characters in set. A range of characters can be specified by separating the end characters of the range, in ascending order, with a '-'. All classes %x described above can also be used as components in set. All other characters in set represent themselves. For example, [%w_] (or [_%w]) represents all alphanumeric characters plus the underscore, [0-7] represents the octal digits, and [0-7%l%-] represents the octal digits plus the lowercase letters plus the '-' character.
The interaction between ranges and classes is not defined. Therefore, patterns like [%a-z] or [a-%%] have no meaning.
[^set]: represents the complement of set, where set is interpreted as above.
For all classes represented by single letters (%a, %c, etc.), the corresponding uppercase letter represents the complement of the class. For instance, %S represents all non-space characters.
The definitions of letter, space, and other character groups depend on the current locale. In particular, the class [a-z] may not be equivalent to %l.
Pattern Item:
A pattern item can be
a single character class, which matches any single character in the class;
a single character class followed by '*', which matches zero or more repetitions of characters in the class. These repetition items will always match the longest possible sequence;
a single character class followed by '+', which matches one or more repetitions of characters in the class. These repetition items will always match the longest possible sequence;
a single character class followed by '-', which also matches zero or more repetitions of characters in the class. Unlike '*', these repetition items will always match the shortest possible sequence;
a single character class followed by '?', which matches zero or one occurrence of a character in the class. It always matches one occurrence if possible;
%n, for n between 1 and 9; such item matches a substring equal to the n-th captured string (see below);
%bxy, where x and y are two distinct characters; such item matches strings that start with x, end with y, and where the x and y are balanced. This means that, if one reads the string from left to right, counting +1 for an x and -1 for a y, the ending y is the first y where the count reaches 0. For instance, the item %b() matches expressions with balanced parentheses.
%f[set], a frontier pattern; such item matches an empty string at any position such that the next character belongs to set and the previous character does not belong to set. The set set is interpreted as previously described. The beginning and the end of the subject are handled as if they were the character '\\0'.
Pattern:
A pattern is a sequence of pattern items. A caret '^' at the beginning of a pattern anchors the match at the beginning of the subject string. A '$' at the end of a pattern anchors the match at the end of the subject string. At other positions, '^' and '$' have no special meaning and represent themselves.
Captures:
A pattern can contain sub-patterns enclosed in parentheses; they describe captures. When a match succeeds, the substrings of the subject string that match captures are stored (captured) for future use. Captures are numbered according to their left parentheses. For instance, in the pattern "(a*(.)%w(%s*))", the part of the string matching "a*(.)%w(%s*)" is stored as the first capture (and therefore has number 1); the character matching "." is captured with number 2, and the part matching "%s*" has number 3.
As a special case, the empty capture () captures the current string position (a number). For instance, if we apply the pattern "()aa()" on the string "flaaap", there will be two captures: 3 and 5.
Thx
In http.request the fourth attribute is a parameter table, which parameters are there?
And how to use thus table, headers data and user agent? There is an example for success and fail function but no one for the parameter table
If you want to use this, you need to google HTML headers etc
It’s not a Codea thing
@Ignatz here I found a bit, but can’t go on… Any help would be accepted! Thx.
http.request{
url = string,
[sink = LTN12 sink,]
[method = string,]
[headers = header-table,]
[source = LTN12 source],
[step = LTN12 pump step,]
[proxy = string,]
[redirect = boolean,]
[create = function]
}
I’ve never used headers, sorry
I only understand the redirect function but I don’t know any need of existing for it:
method: The HTTP request method. Defaults to "GET";
headers: Any additional HTTP headers to send with the request;
source: simple LTN12 source to provide the request body. If there is a body, you need to provide an appropriate "content-length" request header field, or the function will attempt to send the body as "chunked" (something few servers support). Defaults to the empty source;
step: LTN12 pump step function used to move data. Defaults to the LTN12 pump.step function.
proxy: The URL of a proxy server to use. Defaults to no proxy;
redirect: Set to false to prevent the function from automatically following 301 or 302 server redirect messages;
create: An optional function to be used instead of socket.tcp when the communications socket is created.
To use the http I know there are two ways: Eg
http.request{
url = "http://codea.io/talk"
method = "HEAD"
headers = {Here will be headers}
}
or
http.request("http://codea.io/talk", s, e, {headers})
When I use a table ipairs, and I use different classes button, and textpanel, how to put when the class button hasn’t got a method :keyboard, when I put it just in a table I think it will return error, because buttons haven’t got this method, what to do, my ideas were to create another table, but I want it shorter!